It absorbs a lot of the spectrum, both UV and IR. https://en.wikipedia.org/wiki/Electromagnetic_absorption_by_water#/media/File:Absorption_spectrum_of_liquid_w

It absorbs a lot of the spectrum, both UV and IR. https://en.wikipedia.org/wiki/Electromagnetic_absorption_by_water#/media/File:Absorption_spectrum_of_liquid_water.png https://en.wikipedia.org/wiki/Electromagnetic_absorption_by_... However clouds reflect. So high humidity will absorb ir, but thick cloud will reflect. So its a bit more complex.